PostScript is a a fantastic read programming
languageunlike HTMLtailored to graphics, so it is great for
getting a computer/printer to do many precise, repetitive, calculated things
all on its own.
For any \(t\), let us sum up the weights:So we are again forming each point of our curve
as a convex combination of the control points,
and that means all the points of the visit wihtin the convex hull of the control points. 2 of [adobe-1999-plrm3]).
It requires 3 arguments, the red-green-blue components of the colour
each varying from 0 to 1.
A few lines of PostScript can often replace frustrating and
tedious experimentation in a point-and-click environment. htmlMathematica: can import EPS pictures but has trouble with any textual elements
http://stackoverflow.
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It will be a little daunting to figure out if youre just starting to learn PostScript, but I include it as it motivated me to talk about PostScript today.
To extract the current point of the path as we build it,
we use the atend method of a path. ps. You may wonder why I wrote /name when defining
a variable.
The index_ operator requires a single integer argument and
copies the indexed element to the top of the ostack.
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These are the four values we need on the ostack,
so we can now use the rectstroke operator. P.
Mathematica currently has a limited concept of movement by relative displacement along a path.
When the PostScript interpreter encounters the name nfac,
it executes it. ps,
you can give the following command from the command line:However, most of the time we “print” our drawing to a monitor screen.
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Since in postscript an image is defined from the lower left corner,
and the image is defined from its top left corner, the transformation
matrix used here does the appropriate vertical flipping.
There are three other stacks used by the PostScript interpreter:
the dictionary stack (or dstack),
the graphics-state stack,
and the execution stack. Mathematica provids an AnglePath command
to implement turtle graphics:
angular relative movements in along a path. rotate(120).
(We will learn how to deal with this when we discuss the graphics state.
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Like the scoping mechanism in
real-time Java, PostScript’s save and restore allow a
program to declare a scope for memory allocations that follow, and later
exit the scope, causing the memory allocated in it to be reclaimed
at once, without the overhead of a garbage collection.
However, the Mathematica coordinate system is not in points.
In this case the PostScript error messages may be helpful. Staging is also an elegant answer to many stack
manipulation puzzles that arise in PostScript programming: an often-needed
value that’s in the way on the stack can be taken off by staging the
procedure or loop body to simply put the value back when it is needed.
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Furthermore,
it is easy to use PyX to augment and annotate existing
PostScript this article as we will see later.
First, save the current transformation matrix.
This can be convenience for experimentation.
Details can be why not try this out in section on variables. PostScript supports recursion (including tail call elimination),
but it must be handled carefully.
One of the nice things is that the way characters are placed on the
page is no different to any other graphic.
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For comparability we will reset this when we draw.
We now make an arbitrary choice:
we pick \((72,72)\) as the starting position for the path we wish to construct.
PostScript also allows direct control of the line width with the setlinewidth operator.
Then n j roll gives us an upward roll
of the first \(n\) elements of the stack,
and they roll up by \(j\) elements.
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This is a 90 page PDF thats a great way to start learning about PostScript. .